ELLSWORTH, Maine — Three men, including a father and son, are facing drug charges after they were arrested Monday in connection with a Maine Drug Enforcement Agency investigation, according to police.

MDEA agents working in Hancock County learned on Monday that Keith Madore, 52, and his son, Nathaniel Madore, 20, both of Trenton, were expected to obtain a “substantial” amount of oxycodone in Penobscot County and then distribute the pills in Hancock County, according to a prepared statement released Tuesday by MDEA officials.

MDEA officers observed that the Madores met with several people in the Ellsworth area, “presumably to obtain cash with which to buy the prescription drugs,” before driving to Penobscot County to make the purchase, according to the statement. Two other people accompanied the Madores to the location in Penobscot County. The MDEA did not identify the two others or the exact place where the group went.

The group was subsequently followed back to Ellsworth, where members of the Ellsworth Police Department assisted MDEA agents in stopping the truck the group was in. A resulting search of the vehicle and the occupants turned up a total of 2,445 milligrams of oxycodone with an approximate street value of $4,000, according to police.

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The Madores and Zachary Wentworth, 20, of Southwest Harbor, were arrested and each charged with trafficking in a scheduled drug, a Class B felony. The MDEA did not release details about Wentworth’s involvement in the alleged transaction. Class B felonies in Maine are punishable by up to 10 years in prison and a $20,000 fine.

Further charges could be filed in the case as the investigation continues, according to the MDEA.